
<html>
    <body>
    <!-- [ images list ] -->
        <div style="float:right; width:50%; border-left: solid 1px black">
            <div id="listdiv" align="center">
                <h5>Images to be analyzed:</h5>
                <select multiple size=10 id=imglist style="width:80%"></select>
                <br />
                <input type="button" id="evalbutton" value="Analyze" onclick="analyzeImages()" />
            </div>
        </div>
    <!-- [ images list ] -->
        <div style="width:50%">
            <div id="titleblock" align="center">
                <h2>Image Analyzer</h2>
            </div>
            <div id=outputdiv align=center>
                <h4>Status: <span id=status>Idle</span></h4>
                <h5>
                    Latest Results:<br />
                    Red: <span id=redval style="color:red">n/a</span><br />
                    Green: <span id=greenval style="color:green">n/a</span><br />
                    Blue: <span id=blueval style="color:blue">n/a</span><br />
                </h5>
                <h3>Click on images below to select for analysis</h3>
            </div>
        </div>
        <!-- [ sample images ] -->
        <div id=imagediv style="clear:both; text-align:center">
        <hr/>
            <img src="images/mtRainier.jpg" height=150px onclick='return addImage(this);' />
            <img src="images/bellaCoola.jpg" height=150px onclick='return addImage(this);'/>
            <img src="images/seaShell.jpg" height=150px onclick='return addImage(this);'/>
        <!-- [ sample images ] -->
            <img src="images/flower.jpg" height=150px onclick='return addImage(this);'/>
            <img src="images/trees.jpg" height=150px onclick='return addImage(this);'/>
        </div>

    </body>
</html>

<script type="text/javascript">
    var remaining = 0;
    var connected = false;
    //We use this function because connect statements resolve their target once, immediately
    //not at signal emission so they must be connected once the imageAnalyzer object has been added to the frame
    //! <!--  [ connect slots ] -->
    function connectSlots()
    {
        if ( !connected ) {
            connected = true;
            imageAnalyzer.finishedAnalysis.connect(this, finished);
            imageAnalyzer.updateProgress.connect(this, updateProg);
        }
    }
    //! <!--  [ connect slots ] -->

    function finished() {
        setStatus('Idle');
        setResults(imageAnalyzer.red.toFixed(2), imageAnalyzer.green.toFixed(2), imageAnalyzer.blue.toFixed(2));
    }
    //This will function as the receiving "slot" for the progress signal
    function updateProg(complete, max)
    {
        var oldRemaining = remaining;
        remaining = max - complete;
        pullList(oldRemaining - remaining);
        //Prevent results getting messed up if we don't get signals in order
        if( imageAnalyzer.busy ) {
            setStatus('Processing (' + complete + ' of ' + max + ' completed)');
            setResults('Calculating','Calculating','Calculating');
        }
    }

//! <!--  [ analyzeImages ] -->
function analyzeImages() {
    connectSlots();
    var imglist = document.getElementsByTagName('option');
    if (imglist.length > 0) {
        stringlist = [];
        for(var i=0; i<imglist.length; i++) {
            stringlist[i]=imglist[i].value;
        }
        if (!imageAnalyzer.busy) {
            remaining = stringlist.length;
            imageAnalyzer.startAnalysis(stringlist);
        } else {
            alert("Processing, please wait until finished.");
        }
//! <!--  [ analyzeImages ] -->
    } else {
        alert('No images selected. Click on one or more images to select them for analysis.');
    }
}
function clearList() {
    var imglist = document.getElementById('imglist');
    while(imglist.length > 0) {
        imglist.removeChild(imglist.childNodes[0]);
    }
}
function pullList(count) {
    var imglist = document.getElementById('imglist');
    while(imglist.length > 0 && count > 0) {
        imglist.removeChild(imglist.childNodes[0]);
        count--;
    }
}
function setStatus(statusString) {
    document.getElementById('status').innerHTML = statusString;
}

function setResults(red, green, blue) {
    if (! isNaN(red) ) { red += " %"; }
    if (! isNaN(green) ) { green += " %"; }
    if (! isNaN(blue) ) { blue += " %"; }
    document.getElementById('redval').innerHTML = red;
    document.getElementById('greenval').innerHTML = green;
    document.getElementById('blueval').innerHTML = blue;
}
//! <!--  [ addImage ] -->
function addImage(newimg) {
    var imglist = document.getElementById('imglist');
    var curChildren = imglist.childNodes;
    var newline = document.createElement('option');
    newline.innerHTML = newimg.src.substring(newimg.src.lastIndexOf('/')+1);
    newline.value = newimg.src;
    imglist.appendChild(newline);
}
//! <!--  [ addImage ] -->
</script>


